191145239 has 8 divisors (see below), whose sum is σ = 196339920. Its totient is φ = 185976000.

The previous prime is 191145221. The next prime is 191145247. The reversal of 191145239 is 932541191.

It is a happy number.

191145239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191145239 - 2⁸ = 191144983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191145199 and 191145208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191145209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9389 + ... + 21689.

It is an arithmetic number, because the mean of its divisors is an integer number (24542490).

Almost surely, 2^191145239 is an apocalyptic number.

191145239 is a deficient number, since it is larger than the sum of its proper divisors (5194681).

191145239 is a wasteful number, since it uses less digits than its factorization.

191145239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12721.

The product of its digits is 9720, while the sum is 35.

The square root of 191145239 is about 13825.5285251595. The cubic root of 191145239 is about 576.0424582498.

The spelling of 191145239 in words is "one hundred ninety-one million, one hundred forty-five thousand, two hundred thirty-nine".